ABAP stands for Advanced Business Application Programming. It is one of the primary programming languages used for developing programs and applications for SAP R/3 systems and its related modules. It is a high-level language with respect to SAP as it is understood and known only to SAP environment.
The latest version of ABAP which is ABAP Objects follows Object Oriented paradigm. Also, it is fully backward compatible with applications written in previous versions of ABAP whether it is ABAP/4 or other which were highly impressed by COBOL.
Being an Object Oriented Programming language it fully supports features like inheritance, polymorphism, encapsulation, and others.
ABAP serves as an abstracted layer over the database and runs on top of different underlying databases.
From a specialized viewpoint, one majorly performs execution and tuning of the WORK PROCESSES in the SAP framework here, building client profiles and also, doing the fundamental interfacing between the Operating systems and the Oracle Database.